Steam-generator.



No. 692,032. Y l. Patented 1an. 28,1902: s. H. nHEuTAN. STEAM GENERATOR.

(Application led Oct. 19, 1901.) (No Model.) 2 Sheets-Sheet l,

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No. 692,032. Patented 1an. 28, r9o2.`

`G. H. BHEUTAN.

STEAM GENERATOR;

\ (Application med oct. 19,1901.)

(No Model.) 2Sheet s'-Sheet 2.

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U'Nrrnn STATES PATENT Ormes.

GARRETT H. RHUTAN, VOF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OE ONE-HALF TO R. B. LINCOLN, OF WALTHAM, MASSACHUSETTS.

STEAM-G EN ERATOR.

SEECIFIGATION forming part of Letters Patent N o. 692,032, dated January 28, 1902.

Application led October 19, 1901. Serial No. 79,248. KNO modeLl` T0 @ZZ whom/ it may concern,.-

Be it known that I, GARRETT H. RHEUTAN, of San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Steam-Geuerators, of which the following is a specification.

This invention relates to steam boilers or generators of the type set forth in my appli# cation for Letters Patent of the United States, iiled July 16, 1901, Serial No. (58,507.` The boiler set forth in, said application comprises an external boiler forming a casinginclosing a dre-space and havingouter andinnerwalls and van internal wateivtube portion composed of tubes connected at their ends to portions of the inner wall of the outer boiler, said por-` tions constituting tube-sheets, the said tubes extending inwardly and upwardly from the sides to the top of the fire-space.

The present invention has for its chief obi jectto render the water-tubes of the internal an end elevation and partial transverse section of a steam generator or boiler embodying my invention. Fig. 2 represents a side elevation and partial longitudinal section of the same;

The same reference characters indicate the same parts in both gures. p

In the drawings, 1 and 2 represent, respectively, the outer and inner walls of the external boiler portion, which is made approxi-V The water and said spaces do not extend across the ends of the tire-space. The ends ot' the arched external boiler are left open or provided with openings, to which are fitted end pieces or covers 3, the margins of which are detachabl y secured by bolts 4 or 'other fastening means to the ends of the vexternal boiler. The end pieces or covers as here shown comprise metallic t`acingpieces 3l and linings 32, of asbestos, suitably secured to said facing-pieces, the latter having inwardly-projecting anges to support the asbestos lining. The said end pieces or covers 3 may,` however, be of any other suitable construction. Itwillbe seen that the open ends of the arched external boiler and the detachably-secu red covers clos ing said ends enable access to be had to the Vinterior of the respace and to the hereinafter-described water-tubes therein.

The internal watertube boiler is composed of tubes el d, the lower ends of which are inserted in the lowerportions of the inner walls 2 of the external boiler, while their upper ends are inserted in the upper portion of said inner wall, as best shown in Fig. 1, the tubes extending inwardly andA upwardly from the sides to the top of the fire-space. The portions of the inner wall 2 in which the tubes are inserted constitute tube-sheets, which constitute the innerwwalls of waterand steam drums and are crowned or curved inwardly.

intothe fire-space to increase the capacity and strength of the said Water and steani drums. The outer wall 1 of the external boiler is provided with openings 5, which are formed to afford access to the lower tubesheets, in which the lower ends 0f the vtubes d areinserted. To said openings 5 are fitted covers 6, which constitute the outer walls of the water-drums and are detachably secured bybolts '7 to the portions of the external boiler surrounding the openings 5. In the upper portion of the outer wall 1 is an opening 8, which is formed to aord access to the tubesheet in which the upper ends of the tubes d are inserted. To said opening 8 is fitted a cover 9, which constitu tes the ou ter wall ofthe steam-drum and is secured by bolts l0 to the portions ot' theexternal boiler surrounding the opening 8. Said covers 6 and 9 are crowned or curved outwardly'to further in- IOO I crease the capacity and strength of the water and steam drums. It will be seen that the openings 5 and 8 and the detachable covers fitted thereto make the tube-sheets readily accessible, so that the operations of inserting and removing the tubes d may be-very conveniently performed.

q q represent stretches of a sinuous feedwater-conducting pipe interposed between the external boiler and the outer tubes of they internal boiler, said pipe receiving feed-water from a suitable source of supply and conducting it in the directions indicated by the arrows in Fig. 2. There are two of these pipes, one at each side, and each has an extension q', connected with the transverse pipe q q, the ends of which communicate with the lower portions of the external boiler. The feed-water is vtherefore partially heated by the waste heat which has passed through the spaces between the tubes cl.

g represents the outlets for the products of combustion from the fire-space to the flue l2 in the inclosing jacket, said iiue being arranged to conduct the products of combustion away from the jacket to a suitable point of discharge.

13 represents a perforated dry-pipe which extends longitudinally through the steamdrum and conducts the steam therefrom.

I claim- 1. A steam -generator comprising an external boiler forming the sides and top of a casing inclosing a fire-space, the topvand the lower side portions of the inner wall of said boiler being perforated to form tube-sheets, the top tube-sheet constituting the inner wall of a steam-drum while the side tube-sheets form the inner walls of two water-dru ms, bent tubes formed to extend inwardly from said water-drums into the fire-space and upwardly to the steam-drum, said tubes being engaged at their ends with the said tubesheets and constituting an internal watertube boiler, the side and top portions of the outer wall of the external boiler being provided with openings formed to aord access to said tube-sheets, and covers iitting said openings and detachably secured to said outer walls, said covers forming the outer 5o sides of said water and steam drumsand by their detachability enabling access to be had to both the upper and the lower ends of the tubes.

2. A steam-generator comprising an external boiler vforming the sides and top of a casing inclosing a nre-space, the top and the lower side portions of the inner wall of said boiler being curved inwardly into the firespace and perforated to form tube-sheets, the top tube-sheet constituting the inner wall of a steam-drum while the side tube-sheets form the inner walls of two water-dru ms, bent tubes formed to extend inwardly from said waterdrums into the fire-space and upwardly to the steam-drum, said tubes being engaged at their ends with the said tube-sheets and constituting an internal water-tube boiler, the side and top portions of the outer wall of the external boiler being provided with openings formed to afford access to said tube-sheets, and covers fitting said openings and detachably secured to said outer walls, said covers being curved outwardly and forming the outer sides of said Water and steam drums, the inward curvature of the said tube-sheets and the voutward curvature of said covers increasing the capacity and strength of the water and steam drums.

3. A steam-generator comprising an external boiler formed as a casing inclosing a firespace and having outer and inner walls, an internal water-tube boiler composed of tubes secured at their lower ends to the lower portions of the said inner wall and at their upper ends to the upper portion of the inner wall, and water-conducting pipes located between the external boiler and the tubes of the internal boiler, said pipes being connected in series, each series communicating at one end with a source of-feed-water supply, and at the other end with the external boiler.

In testimonywhereof I have affixed my signature in presence of two witnesses.

GARRETT H. RHEUTAN.

Witnesses:

R. B. LINCOLN, C. F. BROWN. 

